Tertiary Fossils

No slide show is available for the Tertiary in Arizona.

Paleontology and geology

During the Tertiary, extensive tectonic activity and volcanism in Arizona provided a wide range of terrestrial habitats, including grasslands, lakes, river systems, and deserts. Three-toed horses, giant tortoises, mastodons, and camels thrived in the region. Deposits of Tertiary rocks occur throughout the state.

Links to more on the Tertiary in Arizona

Paleogeography of the Southwestern U.S.: The paleogeography of the southwestern U.S. from 1.8 billion years ago to 10 million years ago. Text and images by Dr. Ron Blakey from Northern Arizona University.